You're referring to Blue Cross, which is a health insurer. Health insurance is regulated differently than property and casualty insurance, which is the insurance that is most affected by global warming. (I have professional experience with both types). However, through their investment portfolios, both types of insurance company are affected primarily by the damage to coastal real estate that these companies--and the re-insurers--own as investment vehicles. And, as I'm sure you know, most of the premium income taken in by these companies is used for investments.
Finally, you call global warming a "convenient excuse" while the insurance companies, their underwriters and the actuaries for the big re-insurers call it a "recognised risk". There is a difference as, your appelation implies the risk is ficticious while these insurance companies do not consider it a fictional risk--which was my original point.